Method of and apparatus for removing waste yarn in a yarn machine



3,543,49 METHOD OF AND APPARATUS FOR REMOVING WASTE YARN U 8 Am% w m1 M8 ZML mm TYD mi umn R F A ec. H, mm

INVENTORS HARUKI TAKIZAWA MASAKAZU FUJlT ATTORNEYS United States Patent 3,543,499 METHOD OF AND APPARATUS FOR REMOVING WASTE YARN IN A YARN MACHINE Haruki Takizawa and Masakazu Fujita, Matsuyama-shi, Japan, assignors to Teijin Limited, Osaka, Japan Filed Dec.18, 1968, Ser. No. 784,798 Claims priority, application Japan, Dec. 21, 1967, 42/82,290 Int. Cl. D01h 1/38 US. Cl. 5734 3 Claims ABSTRACT OF THE DISCLOSURE Method and apparatus for removing waste yarn spools from draw-twister apparatus. Two waste yarn spools are placed on the bobbin spindle, and when the upper Waste yarn spool is full, the waste yarn is automatically wound on the lower spool until the next time that the bobbin is removed, at which time the waste yarn spools are replaced.

This invention relates to methods of and an apparatus for removing the starting waste yarn occurring during a yarn twisting operation. The process of this invention is applicable to ring twisters and false twist machines as well. Twisting, drawing, and similar operations on yarn are conducted with such machines and yarn is wound onto bobbins. During threading operations and during the commencement or termination of winding operations, the occurrence of waste yarn is inevitable. Since such inferior yarn is not desired to be wound onto the bobbin, it is wound on another package for removal. The present invention is related to such method and an apparatus for practising such process.

Heretofore, generally accepted methods for removing the starting waste yarn in yarn twisting operations are to wind the waste yarn onto a single waste yarn spool, which is detachably secured below the bobbin and to wind acceptable yarn onto the bobbin after it has appeared. Thus, after a predetermined amount of consisten yarn has been wound on the bobbin, the yarn is again wound onto the waste yarn spool to remove waste yarn occurring during the termination of winding when the yarn machine is stopped. Then, the full bobbin is pulled out of the spindle and an empty bobbin is mounted. Again, the yarn machine is started and waste yarn occurring at the commencement of the winding operation is Wound on the waste spool, and the subsequent acceptable yarn is wound on the bobbin. After the bobbin becomes full, the waste yarn is again introduced on to the waste yarn spool. The operation is thus repeated and proceeds forward, until the time when the yarn is cut because the Waste spool is full.

However, this transfer of the yarn is simply done between the bobbin and waste yarn spool and little affects the operation. When the operation proceeds and the waste yarn spool becomes full, it should be replaced. At that time, unless the yarn running on the yarn machine is cut, the replacement of the waste yarn spool is impossible. If the yarn is cut, rethreading of the draw-yarn machine is inevitable. resulting in a great loss of time and labor.

The primary object of the present invention, which has been devised for the purpose of eliminating such a loss of time and labor is to continuously conduct operations without cutting the running yarn on the yarn machine between the bobbin and waste yarn spool and to eliminate the disadvatage of the conventional process. In the conventional method, the waste yarn is Wound on one waste yarn spool. If such a spool becomes full, it must be replaced. In the present invention, a plurality of waste yarn spools are provided one upon another detachably on the same axis.

This invention enables a full waste yarn spool to be replaced without cutting the as-wound yarn on the yarn machine, by providing detachably multistage waste yarn spools and introducing the waste yarn to the lower spool when the upper spool has become full, during the time of which the upper full spool is replaced and later winding of the waste yarn is onto the upper new empty spool.

The object of the present invention is to substantially eliminate time and labor which conventional operations would otherwise require by replacing a full waste yarn spool without cutting the as-wound yarn running on the yarn machine.

Another object of this invention is to lessen the waste of yarn by minimizing the number of rethreading operations and maintaining the amount of waste yarn to a minimum.

The objects of this invention will be apparent by reference to the following description taken in connection with the accompanying drawings wherein.

FIG. 1 is a diagrammatic front sectional view of an apparatus for performing the removal of inconsistent, waste yarn, and

FIG. 2 is a perspective view of a waste yarn spool.

This invention contains two embodiments relating to each other. Referring to the drawings, the first embodiment is explained below.

In FIG. 1, yarn 1 which has left the last rollers (not shown) of the yarn machine is wound onto bobbin 6 after it is passed through guide 2 and traveler 4 set on ring 3, said bobbin 6 being detachably mounted on spindle 5 positioned in the center. Upper waste yarn spool 8 and lower waste yarn spool 9 are detachably secured on the lower part 7 of said spindle '6.

In threading the machine, the waste yarn at the time of the start of the operation is wound onto upper waste yarn spool 8, with ring 3 positioned as shown in FIG. 1. The moment acceptable yarn appears, ring 3 is pushed upwards and the yarn is wound on bobbin 6. When bobbin 6 becomes full, ring 3 is lowered and returned to the waste yarn spool *8 position, whereby waste yarn at the time of termination of the winding operation is wound onto upper waste yarn spool 8 when the yarn machine is stopped. After the full bobbin has been replaced by an empty one, the yarn machine is started, and the waste yarn at the beginning is wound on upper spool 8. When consistent yarn appears ring 3 is pushed upwards to wind said consistent yarn on the new empty bobbin 6. In this case, as mentioned above, the yarn machine is at a standstill with the yarn donned and consequently, operation may be resumed only by starting the apparatus, without any rethreading operations. The above operations are thus repeated several times until upper spool 8 becomes full of waste yarn. Then ring 3 is moved to the lower spool 9 position (position shown with dotted lines in FIG. 1) and the waste yarn occurring at the time of termination of the winding-operation is Wound on lower spool 9 when the yarn machine is stopped. Now, the full upper waste spool can be replaced by an empty one without cutting yarn on the yarn machine. It is desirable in this case to use the lower spool a little earlier and transfer the yarn to the upper spool, since it is only the upper spool that is replaced and the lower spool is to be used only intermittently. If the lower spool is only used when the upper spool becomes full and is replaced, it takes a long time for the lower spool to become full. In the process of this invention there is no need to rethread the machine until the lower spool becomes full. The amount of waste yarn wound on the waste yarn spool is the greatest at the first theading operation because donning requires a lot of time, during the time of which the waste yarn is all wound on the waste yarn spool. In subsequent dofiings (replacement of a full bobbin by an empty one), the amount of waste yarn at the commencement and termination of winding operations is small. Heretofore, in the method using only one waste yarn spool, the amount of waste yarn Wound thereon is greater because donning operations are always conducted at the start. Thus, only two or three dofiings are continuously possible.

The number of donning operations and the amount of waste yarn thus increase. On the other hand, the method in this invention is to replace the upper waste yarn spool many times without cutting the yarn running on the machine and only with the starting donning. The present method is extremely efiicient and results in much less waste yarn. The number of continuous doffings with two spools amounts to 8 to 10 times as many as that with one spool. A single embodiment with 2 spools has been described, but the scope of the invention includes 3 spools or more.

FIG. 2 shows a waste yarn spool to be used. Waste yarn spools 8 and 9 have flanges 10 and 11, and 12 and 13, respectively, and adjacent flanges 11 and 12 of spools 8 and 9 have notches 14. Without notch 14, the transfer' of the yarn from each spool to the other would be impossible. After the upper spool has become full, the yarn is to be transferred to the lower spool, but the yarn movement would be prevented by flanges 11 and 12, even if ring 3 is lowered to the lower spool. The number of notches may be plural.

As mentioned above, by the present invention, continuous dofiings 8 to 10 times as many as those in the conventional apparatus become possible, resulting in drastic decrease in time, labor and the amount of waste yarn.

What is claimed is:

1. In a process for removing waste yarn from uniform yarn in a yarn machine wherein waste yarn is removed from a bobbin by winding onto a waste spool saidwaste yarn occurring at the time of threading of the yarn machine, or at the commencement and termination of winding the yarn onto a bobbin from said machine, the improvement for replacing a full waste spool with an empty waste spool without cutting the running yarn on said machine, which comprises installing multistage waste spools detachably around the bottom of a spindle of said bobbin, transferring said waste yarn to the lower of said waste spools when the upper of said waste spools has been wound fully, replacing said full upper waste spool by an empty waste spool, and returning the waste yarn to the upper empty spool.

2. In a yarn machine fitted with a rotatable spindle and having a bobbin for winding yarn mounted on said spindle, an apparatus for removing waste yarn from uniform yarn in said yarn machine comprising multistage waste spools detachably mounted around the bottom of said spindle, said multistage waste spools having upper and lower flanges, respectively, and being separable from each other.

3. An apparatus according to claim 2 wherein adjacent flanges of said multi-stage waste spools have common notches.

References Cited UNITED STATES PATENTS 2,909,026 10/1959 Bakker 57-34 2,970,789 2/1961 Binns 57-34 XR 3,162,993 12/1964 Green 57-34 JOHN PETRAKES, Primary Examiner U.S. c1. X.R. 57-156; 242 1s 

